解决java.util.NoSuchElementException 博主 默语带您 Go to New World....解决java.util.NoSuchElementException 如果你曾经在Java编程中遇到了java.util.NoSuchElementException异常,那么你肯定知道这是一种令人头痛的问题...在访问集合元素之前,始终要检查集合是否为空,以避免触发java.util.NoSuchElementException。...异常处理 当遇到java.util.NoSuchElementException异常时,应该适当地处理它,而不是简单地忽略它。...总结 java.util.NoSuchElementException异常可能会在Java编程中出现,但它并不是无法解决的问题。
一、分析问题背景 java.util.NoSuchElementException是Java中常见的运行时异常,它通常发生在使用迭代器(Iterator)或类似集合结构(如List、Set、Queue等...三、错误代码示例 以下是一个可能导致NoSuchElementException的代码示例: import java.util.ArrayList; import java.util.Iterator...(true) { // 错误的无限循环,没有检查hasNext() String element = iterator.next(); // 当list为空时,这里会抛出NoSuchElementException...因此,当调用next()方法时,由于列表是空的,所以会抛出NoSuchElementException。
报错:NameError: name 'NoSuchElementException' is not defined 如图 ?...解决方法: 头部加一句:from selenium.common.exceptions import NoSuchElementException 可解决 ?...参考:https://stackoverflow.com/questions/19200497/python-selenium-webscraping-nosuchelementexception-not-recognized
如果你在跑selenium脚本时,需要某些异常不知道怎么解决时,可以看看这一系列的文章,看看有没有你需要的答案
捕获异常后可以打印出异常原因,这样以便于分析异常原因 2.从如下异常内容可以看出,发生异常原因是:NoSuchElementException selenium.common.exceptions.NoSuchElementException...to locate element: {"method":"id","selector":"blog_nav_newpostxx"} 3.从selenium.common.exceptions 导入 NoSuchElementException...三、参考代码: # coding:utf-8 from selenium import webdriver from selenium.common.exceptions import NoSuchElementException...yoyoketang/") # 定位首页"新随笔" try: element = driver.find_element("id", "blog_nav_newpostxx") except NoSuchElementException...msg: print u"查找元素异常%s"%msg # 点击该元素 # 交流QQ群:232607095 else: element.click() 四、selenium常见异常 1.NoSuchElementException
nsee = new NoSuchElementException( appendStats("Unable to activate object...nsee = new NoSuchElementException( appendStats("Unable to validate...异常,跳出循环;只有在不为null且allocate失败的时候会重置为null继续循环;另外如果是create出来的但是activate不成功也会抛出NoSuchElementException异常,跳出循环...nsee = new NoSuchElementException( appendStats("Unable to validate...(Pool exhausted)跳出循环;如果blockWhenExhausted为true,block之后获取到的还是null,也会抛出NoSuchElementException(Timeout waiting
nsee = new NoSuchElementException( appendStats("Unable to activate object...nsee = new NoSuchElementException( appendStats("Unable to validate...异常,跳出循环;只有在不为null且allocate失败的时候会重置为null继续循环;另外如果是create出来的但是activate不成功也会抛出NoSuchElementException异常,跳出循环...nsee = new NoSuchElementException( appendStats("Unable to validate...跳出循环,否则重置为null继续循环总结一下就是如果是create有异常(JedisException)则直接抛出,如果borrow不到(即使经过create)也会抛出NoSuchElementException
poll 队列空时:return null examine element 队列空时:NoSuchElementException peek 队列空时:return null 二、双端队列(Deque...也就是说,使用时必须判空 pollFirst 队列空时:return null removeLast 队列空时:NoSuchElementException pollLast 队列空时:return...null examine getFirst (变态,element成了get) 队列空时:NoSuchElementException 使用时必须判空 peekFirst 队列空时:return null...getLast 队列空时:NoSuchElementException peekLast 队列空时:return null 三、栈 Deque定义了LIFO的栈操作 栈方法 内部调用 备注 push...addFirst 1、元素不能为空 2、可能抛出异常,内部调用的是addFirst pop removeFirst 队列空时,会抛出异常NoSuchElementException peek peekFirst
{ 51 String value = getValue(key); 52 if (value==null){ 53 throw new NoSuchElementException...defaultValue; 64 } 65 66 /** 67 * 取出Integer类型的Property,System优先 68 * @throws NoSuchElementException...{ 71 String value = getValue(key); 72 if (value==null){ 73 throw new NoSuchElementException...90 String value = getValue(key); 91 if (value == null) { 92 throw new NoSuchElementException...109 String value = getValue(key); 110 if (value == null) { 111 throw new NoSuchElementException
If validation fails, a {@code NoSuchElementException} * is thrown....method will either block (if * {@link #getBlockWhenExhausted()} is true) or throw a * {@code NoSuchElementException...} } if (p == null) { throw new NoSuchElementException...; } } else { if (p == null) { throw new NoSuchElementException...nsee = new NoSuchElementException( "Unable to activate object");
* 如果流为空,抛出[NoSuchElementException]。...as S, value) } else { value } } if (accumulator === NULL) throw NoSuchElementException...* 为空流抛出[NoSuchElementException],为流抛出[IllegalStateException] * 包含多个元素的。...* 如果流为空,则抛出[NoSuchElementException]。...= NULL collectWhile { result = it false } if (result === NULL) throw NoSuchElementException
If validation fails, a {@code NoSuchElementException} * is thrown....method will either block (if * {@link #getBlockWhenExhausted()} is true) or throw a * {@code NoSuchElementException...} } else { if (p == null) { throw new NoSuchElementException...nsee = new NoSuchElementException( "Unable to activate object");...nsee = new NoSuchElementException( "Unable to validate object");
它们会在链表为空时,抛NoSuchElementException 下面再看peek()和peekFirst() /** * Retrieves, but does not remove...* * @return the last element in this list * @throws NoSuchElementException if this list...* * @return the first element from this list * @throws NoSuchElementException if this...* * @return the last element from this list * @throws NoSuchElementException if this...(); return unlinkLast(l); } 可以看到removeLast()在链表为空时将抛出NoSuchElementException pollLast()
* * @return the first element in this list * @throws NoSuchElementException if this list...* * @return the last element in this list * @throws NoSuchElementException if this list...* * @return the first element from this list * @throws NoSuchElementException if this...* * @return the last element from this list * @throws NoSuchElementException if this...* * @return the last element in this list * @throws NoSuchElementException if this list
") { intercept[NoSuchElementException] { Set.empty.head } } } //FlatSpec import org.scalatest.FlatSpec...An empty Set" should "have size 0" in { assert(Set.empty.size == 0) } it should "produce NoSuchElementException...when head is invoked" in { intercept[NoSuchElementException] { Set.empty.head } } } //FunSpec...when head is invoked") { intercept[NoSuchElementException] { Set.empty.head...") { forAll(examples) { set => a [NoSuchElementException] should be thrownBy { set.head }
1、封装一个函数,判断当前元素是否存在 from selenium.common.exceptions import NoSuchElementException def isElementExist(...用来判断元素标签是否存在, """ try: element = driver.find_element_by_xpath(xpath_value) # 原文是except NoSuchElementException..., e: except NoSuchElementException as e: # 发生了NoSuchElementException异常,说明页面中未找到该元素,返回False
org.openqa.selenium.Cookie; 14 import org.openqa.selenium.JavascriptExecutor; 15 import org.openqa.selenium.NoSuchElementException...return new JSWebElement((RemoteWebElement)wd.findElementById(using)); 249 }catch (NoSuchElementException...return new JSWebElement((RemoteWebElement)wd.findElementByXPath(using)); 265 }catch (NoSuchElementException...return new JSWebElement((RemoteWebElement)wd.findElementByLinkText(using)); 273 }catch (NoSuchElementException...using)); 282 return new JSWebElement((RemoteWebElement)we); 283 }catch (NoSuchElementException
empty).or(() -> Stream.of(3).findAny()).ifPresent(System.out::println); 然后是java10中出现的 如果有值则获取,无则直接抛出NoSuchElementException...异常 /** * If a value is present, returns the value, otherwise throws * {@code NoSuchElementException...* * @return the non-{@code null} value described by this {@code Optional} * @throws NoSuchElementException...value is present * @since 10 */ public T orElseThrow() { if (value == null) { throw new NoSuchElementException
expected_conditions as EC from selenium.common.exceptions import TimeoutException, ElementNotVisibleException, NoSuchElementException...1.NoSuchElementException:没有找到元素 2.NoSuchFrameException:没有找到iframe 3.NoSuchWindowException:没找到窗口句柄handle...import Keys from selenium.webdriver.support.ui import Select from selenium.common.exceptions import NoSuchElementException...is_element_present(self, how, what): try: self.driver.find_element(by=how, value=what) except NoSuchElementException...is_element_present(self, how, what): try: self.driver.find_element(by=how, value=what) except NoSuchElementException
selenium.webdriver.common.keys import Keys from time import sleep from selenium.common.exceptions import NoSuchElementException...print("元素找到了") element = driver.find_elements_by_class_name('home-btn-2') print(“按钮找到了”) except NoSuchElementException...selenium.webdriver.support.ui import Select from time import sleep from selenium.common.exceptions import NoSuchElementException...try: driver.find_element_by_xpath("//*[contains(text(), 'cb7: normal checkbox')]").click() except NoSuchElementException...//www.***.com/") sleep(5) try: driver.find_element_by_css_selector("li.login").click() except NoSuchElementException